State police at Hamburg said the crash happened at 2:20 p.m. when the load on the rig he was driving shifted and a front tire blew out while he was entering I-78 from the northbound ramp of Route 61 in Tilden Township, Berks County.

Troopers said the rig traveled 70 feet down the entrance ramp and 120 feet onto I-78 before hitting the concrete medial divider, which kept it from falling into the westbound lanes.

Investigators said the left side of the rig was on top of the medial divider, with 4 feet of it hanging over the medial in the westbound passing lane.

Troopers said westbound traffic was limited to one lane until the wreckage was cleared. PennDOT, Hamburg police and Hamburg Fire Police set up a detour for eastbound traffic over Old Route 22 through Hamburg and back onto I-78 east of the borough.